Back then, I was still a high school student attending ○ school. After the midterm exams, both I and the delinquent Tetsuya, who was failing, had to attend remedial classes with teacher Akari. Tetsuya acted like his usual delinquent self, barely hiding his discomfort, but watching the scene, I felt strangely thrilled. However, I encountered an unexpected situation. Before class began, I found myself frozen in place inside the classroom, witnessing an unbelievable sight—Teacher Akari tenderly taking Tetsuya's swollen cock deep into her soft-looking lips. In that instant, I made a decision. If Tetsuya gets to be enveloped by her upper lip, then I must be enveloped by her lower lip. That resolve began to grow inside me.